Deckard: She's a replicant, isn't she? Tyrell: I'm impressed. How many questions does it usually take to spot them? Deckard: I don't get it, Tyrell. Tyrell: How many questions? Deckard: Twenty, thirty, cross-referenced. Tyrell: It took more than a hundred for Rachael, didn't it? Deckard: [realizing Rachael believes she's human] She doesn't know. Tyrell: She's beginning to suspect, I think. Deckard: Suspect? How can it not know what it is?

[Batty wants Tyrell to extend his lifespan] Tyrell: Would you... like to be upgraded? Batty: I had in mind something a little more radical. Tyrell: What... what seems to be the problem? Batty: Death. Tyrell: Death; ah, well that's a little out of my jurisdiction. You... Batty: *I want more life, fucker/father!* (IMDb Editor's note: see trivia section for details)

Tyrell: [Tyrell explains to Roy why he can't extend his lifespan] The facts of life... to make an alteration in the evolvement of an organic life system is fatal. A coding sequence cannot be revised once it's been established. Batty: Why not? Tyrell: Because by the second day of incubation, any cells that have undergone reversion mutation give rise to revertant colonies, like rats leaving a sinking ship; then the ship... sinks. Batty: What about EMS-3 recombination? Tyrell: We've already tried it - ethyl, methane, sulfinate as an alkylating agent and potent mutagen; it created a virus so lethal the subject was dead before it even left the table. Batty: Then a repressor protein, that would block the operating cells. Tyrell: Wouldn't obstruct replication; but it does give rise to an error in replication, so that the newly formed DNA strand carries with it a mutation - and you've got a virus again... but this, all of this is academic. You were made as well as we could make you. Batty: But not to last. Tyrell: The light that burns twice as bright burns half as long - and you have burned so very, very brightly, Roy. Look at you: you're the Prodigal Son; you're quite a prize! Batty: I've done... questionable things. Tyrell: Also extraordinary things; revel in your time. Batty: Nothing the God of biomechanics wouldn't let you into heaven for.

Tyrell: I'm surprised you didn't come here sooner. Batty: It's not an easy thing to meet your maker. Tyrell: What could he do for you? Batty: Can the maker repair what he makes?

Tyrell: We began to recognize in them a strange obsession. After all, they are emotionally inexperienced, with only a few years in which to store up the experiences which you and I take for granted. If we gift them with a past, we create a cushion or a pillow for their emotions, and consequently, we can control them better. Deckard: Memories! You're talking about memories!

Tyrell: Is this to be an empathy test? Capillary dilation of the so-called blush response? Fluctuation of the pupil. Involuntary dilation of the iris... Deckard: We call it Voight-Kampff for short.